Digmen1 - 8:18 pm on Sep 10, 2010 (gmt 0)
Considering Google is a huge company and gets all of its income from advertising you should expect to see some big spenders on Adwords.
If there were not, then Google would be on it sway out.
Like others above I query the ROI on adwords, that's why my small company does not spend any money on it. Plus the fact that its too time intensive.